131 



THE TERTIARY BROWN-COAL BEARING BEDS 

 OF MOORLANDS. 



By Sir Douglas Mawson, D.Sc, B.E., and Frederick 

 Chapman, A.L.S., F.R.M.S. 



[Read June 8, 1922.] 



Page 

 I. Intsoduction ... ... ... ... ... ... 131 



II. General Physiography and Geological Features 132 



III. The Tertiary Strata at Moorlands 135 



Division 1. — Recent Surface Formation. 



Division 2. — Kalimnan (Lower Pliocene) Oyster 



Bed. 

 Division 3. — Janjukian (Miocene) Marine Beds. 

 Section A. — Green and yellow 



Clays, Marls, and Sands. 

 Section B. — Light-grey and dark- 

 grey Clayey Marls and Cal- 

 careous Muds. 

 Section C. — Marine Limestone 

 and Carbonaceous Muds usually 

 pyritised. 

 Division 4. — Janjukian Lacustrine Carbonaceous 

 Beds witli Lignite. 

 * IV. Comparison between the Beds in South Australia 



and Victoria ... ... ... ... ... ... 146 



I. Introduction. 



The occurrence of brown coal in Tertiary strata in the 

 vicinity of Moorlands, a railway station on the Pinnaroo 

 line about 87 miles from Adelaide, has led to very consider- 

 able mining activity thereabouts during the past two and a 

 half years. As a result, much valuable geological informa- 

 tion has been collected in an area where otherwise no 

 geological section of the beds would be available. 



We are particularly indebted to Mr. A. C. Broughton, 

 the representative on the field of the principal mining com- 

 pany, for assistance in procuring data and material amplify- 

 ing such as was secured on our own visits, which date back 

 to the inception of the present mining enterprise. The 

 Government Geologist has also favoured us with information 

 required relating to the Government bores. 



Though the main bulk of these notes were prepared 

 more than two years ago, publication has been delayed in 

 case important additional information relating to tlie beds 

 should accrue as a result of mining development. In the mean- 



